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ヨネハラ アツノリ
YONEHARA ATSUNORI
米原 厚憲 所属 京都産業大学 理学部 宇宙物理・気象学科 職種 教授 |
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| 言語種別 | 英語 |
| 発行・発表の年月 | 2006/07 |
| 形態種別 | その他 |
| 標題 | Constraining the size of the narrow-line region in distant quasars |
| 執筆形態 | その他 |
| 掲載誌名 | ASTROPHYSICAL JOURNAL |
| 出版社・発行元 | UNIV CHICAGO PRESS |
| 巻・号・頁 | 646(1),pp.16-22 |
| 著者・共著者 | Atsunori Yonehara |
| 概要 | We propose a proper method of measuring the size of the narrow-line regions (NLRs) in distant quasars. The apparent angular size of the NLR is, in general, too small to resolve technically. However, it is possible to map the NLR with gravitational lensing. In our method, we directly compare the observed image of the NLR with the expected lensed images of the NLR for various source sizes and lens models. Seeking the best-fit image via the comparison procedures, we can obtain the best-fit size and the best-fit lens model. We apply this method to the two-dimensional spectroscopic data of a famous lensed quasar, Q2237+0305. If the lens galaxy resembles the applied lens model, an upper limit to the NLR size can be set of 750 pc. Furthermore, we examine how the fitting results will be improved by future observations, taking into account realistic observational effects, such as seeing. Future observations will provide us more stringent constraints on the size of the NLR and on the density profile of the lens galaxy. |
| DOI | 10.1086/504824 |
| ISSN | 0004-637X |